Square D | PQ4620 | Fusible Bus Plug | 200A | 4-Pole | 600V

Square D PQ4620 Fusible Bus Plug is a purpose-built protection module designed for maintenance, retrofit, and replacement tasks in compatible Square D distribution gear. With a 200A rating and 4 poles at 600V, this fusible bus plug delivers reliable, plug-in protection where your system needs it most.

• Amperage: 200 A
• Poles: 4-Pole
• Voltage rating: 600 V
• Part number: PQ4620

Why this fusible bus plug matters

In electrical distribution, reliable protection and minimal downtime are essential. The PQ4620 is designed to seamlessly integrate with compatible Square D equipment, enabling quick deployment during routine maintenance, system upgrades, or urgent replacements. The four-pole configuration supports multi-line protection within a single plug-in device, streamlining wiring and reducing the risk of mismatched components.

Key use cases

• Maintenance: replace aging or failed fusible bus components without reworking the entire panel.
• Retrofit: add fusible protection to existing bus sections to improve safety and compliance.
• Replacement: convenient substitute for worn or obsolete bus plugs with matching ratings.

Compatibility and installation notes

Before ordering, confirm fit and ratings with your equipment's bus assembly. The PQ4620 part number is the most reliable reference for compatibility with Square D switchgear and bus configurations. This is a plug-in solution, intended for installation by qualified personnel following all applicable safety procedures and lockout/tagout practices.

Practical tips

• Keep the original part number when requesting replacements to ensure exact match.
• Verify that your system operates within the 600V rating and 200A capacity before installation.
• Store a spare PQ4620 in service-ready condition to minimize downtime during maintenance windows.